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Date: Sun, 01 May 2005 13:23:00 -0000
From: "kpmassey at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Message-ID: <20050501132249.21316.kpmassey@gmail.com>
Reply-To: gcc-bugzilla@gcc.gnu.org
Subject: [Bug c++/21316] New: pointer lookup cache misses more frequent
X-Bugzilla-Reason: CC
X-SW-Source: 2005-05/txt/msg00068.txt.bz2
List-Id: <gcc-bugs.sourceware.org>

The sample code runs 30-50% slower on my machine when compiled with 3.4.3 as
opposed to 3.3.4.  It creates some objects and then references them via pointer
lookup, so my best guess is that somehow 3.4.3 binaries have many more cache misses.

I have noticed the severe regression on AMD Athlon 3200 running linux 2.6, with
compile options -O3 -march=k8.  Other options (e.g. -O2 instead) don't help.

-- 
           Summary: pointer lookup cache misses more frequent
           Product: gcc
           Version: 3.4.3
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: kpmassey at gmail dot com
                CC: gcc-bugs at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21316